Type-writing machine.



T. E. *BUS'GHMANN; TYPE WRITING MACHINE. APPLICATION FILED JUNE 28, 1913.

Patented Mar. 23,1915.

2 SHEETS-SHEET 1.

T. E. BUSUHMANN E'YPE WRITING MACHINE. APPLIGATION rum) mm: 28, ma

1 1 3 9 Patented Mar. 23, 1915.

2 SHEETS-SHEET 2.

THEODOR EUGEN BU SCHMANN, 0F CHEMNITZ, GERMANY, 'ASSIGNOR TO THE FIRM WANDERER. WERKE VORM. WINKLHOFIER & JAENICKE AKT.- GES., OF SCHGNAU,

NEAR CHEMNI'IZ, GERMANY.

TYPE-WRITING MACHINE.

Application filed June 28, 1913.

"ments in Type-Writing Machines, of which the following is a specification.-

- When preparing certain work on the type writer, es ecially when billing or invoicing and simu taneously making copies of the invoice on the leaves of a book or making carbon copies, it is desirable. to have a mechanism on the typewriter which permits of, rotating the paper cylinder or platen backward to a certain degree in order, after the completion of one sheet of the invoice,

to be able to insert the'next sheet into the typewriter in such a manner that, retaining a certain distance from the last line on the page of the book, its next line to be written comes into the printing line, corresponding to thefirst writing line of the invoice sheet.

Billing mechanisms for rotating the paper cylinder of the kind referred to in the present invention are already known, the con.- struction being that by means of a. device controlled by a crank the backward rotation of the platen by a certain amount and the forward'rotation only by, the same amount can be effected by means of this crank. In these known devices the adjusting mechanism, including the crank, is generally on the left side of the machine (but always only on one side) so that the typist is compelled to always effect the adjustment on that one side of the machine. Further, the knownrbilling mechanism requires the paper carriage to be withdrawn to such an extent toward one side that the crank may be rotated without fouling the frame of the type writer. The billing. mechanism according to the present invention differs substantially from these known devices in that the backward rotation, on adjusting the platen, is effected to only a determined degree by means of the billing mechanism, whereas the forward rotationis unrestricted Further no crank or similar device is necessary for operating the billing mechanism, but the ro-' tation' of" an ordinary handwheel on the platen is sufficient, and it is quite immaterial whether the right hand or the left hand Specification of Letters Patent. Patented Mal, 23, 1915.

Serial No. 776,333.

wheel is rotated or in what position the platen may be situated. This result is attained by the billingmechani'sm being connected with the paper cylinder by means of a coupling which is so arranged, that on the backward rotation the paper roller is automatically coupled with the billing mechanism and thereby its movement is restricted, whereas on the forward rotation the platen. is released so that it is not restricted in the further rotation. This formation ofthe billmg mechanism renders it possible according to another form of construction of the in vention, to obviate another disadvantage often to be seen in such'mechanisms.

In order to withdraw the invoice sheet, the paper guide rollers must be raised from the platen. It is often overlooked, after withdrawing the invoice, to return the pa er guide rollers against the platen so that, a ter with regard to the sheet of the book. Inorder to obviate this ea dp antage the present billing mechanism" for the rotation of the platen in typewriters is formed in such a manner, that bylmeans of the backward rotation of the platen when the paper guide is open, the latter is automatically closed and is secured against opef'hg. The device for preventing the paper'l' guidc opening comes into action. as soon a's the backward rotation the platen has commenced, i. e. the opening of the p oer guide rollers is only possible, when the platen, together with the turning back the platen, the new invoice ,sheet is not inserted in the correct position into the operative position while Fig. 3

shows the billing mechanism out of action.

Fig. 4' is a further form of construction of the new billing mechanism with the members of the typewriter directly appertain-j" ing to same, as seen from the left hand end of tl e platehEndparny in section, while Figs. 5 to 7 show the billing mechanism in various working positions from the front end of the platen.

1 is the paper carriage end piece for sup porting the platen E23, 2 is the release lever for the paper feed rollers and 3 is a pinshaped extension on the swingingpin of the release lever The axle 1 of the billing mechanism, which at tlle same time carries a hand wheel 21 is preferably screwed in the axle 5 of the platen. ()n the axle t is rotatfabiy mounted a limiting dish Twith a stop 6 and to the right oi said disk on the screwed part of the axle 4 there is screwed a washer 8 secured by a. lock nut 9. Finally the axle 4 carries to the right of said locl nut the cup shaped main body or housing 10 of the billing mechanism which forms a closed housing with the limiting disk 7 and, with its guiding flange for the locking ball 8 surrounds the washer 8 allowing a certain play. in order to secure the above mentioned parts in their position in relation to one another there is provided a collar 11 on the axle 1 while the main body 10 or housing is prevented from rotating about the axle 4- by the pin 3 engaging in a slot therein. The washer 8 is provided in its periphery with circular notches, similar to a toothed wheel for receivingthe locking ball 8 urged by a spring a which strives to fall into the notches in the washer 8 so that it is carried around by said washer and brought into contact with the stop 6. In the guiding flange of the main body 10 of the housing there is provided a slot in which is insertcd a piece 14: which is provided with a slot 15 and a, nose 15. Close to this piece there ismounted in the flange oi. the main body a handle '13 which carries a projection 12 provided with bevels 12 12", Fig. 3, and

by the help of which the locking ball 8 may be pressed back into the slot 15 in the piece 14. In the slot 15 there may be preferably arranged a spring which is compressed by the inwardly moved locking ball and on the ball being released said spring moves the ball out of the slot 15. For the purpose of adjusting the stop 6, a number of adjusting holes are provided in the limiting disk 7, in which holes there engages the round pin of an adjusting screw 16 arranged in the flange of the main body 10.

The operation of the present invention is as follows A. loose leaf 17 of the invoice book is inserted into the typewriter in the usual manner together with the carbon paper 18 and the invoice sheet 19, and corresponding to the heading of the invoice the stop 6 is ad justed with relation to the locking ball 8 by means of the adjusting holes in the limiting disk 7 and the screw 16. When an. invoice is complete it is removed from the typewriter after releasing the paperfeed rollers 22 from the platen. It is necessary during this operation to holdfl thcjlcat 11 together with the carbon paperflbyiineaiis at a device, for instance by meansotfthelisual paper holding bar in connection with special holding or clamping rollers in'such' a man.- ner that there can be no movement of the same on withdrawing the invoice sheet. ;.The paper feed roller i to bear against the' platen and the latter is rotated backward to the determined extent by turning either the right-hand or theletthand hand wheel 21. A new invoice sheet is now inserted and the platen is rotated forward in the usual manner until the date line of the invoice head is brought level with the line indicator 20.

The locking ball 8 together with the projection 19 operate in such a manner that by swinging the handle 13 on the projection out of the position shown in Fig. 2 into that shown in Fig. 3, the slopingsurfaces of the projection 12 force the ball S 'intothe slot 15. In this position of the ball the billing mechanism is out ofvaction, and the platen may be rotated backward or forward at will. If however, with the freed ball as shown in Fig. 2, the platen is rotated in the direction of the arrow B then the washer 8 takes with it the ball until this meets with the stop 6, whereby the platen is prevented from rotating farther backward. If the platen is rotated in the'direction oft-he ar row V Fig. 2 then the locking bad 8 which is diverted by the nose 1.5 slides into the slot 15, and can therefore not be taken along with the washer 8 so that no jamming-occurs and the platen may be i itated freely l on ward at will. I

It is to be noted. that the whole billing mechanism on the axle 4: is united with the hand wheel to form a connected whole so that the device can be readilyapplied to or interchanged on any typewriter by in serting the axle 4 into the platen.

In the explanation of the methodof work ing of the above described form construction of the invention it was stated that it is necessary to release the ,paper'feed rollers or to lift same trom'the platen when a completed invoice is to. be with the writin This disadvanta e is removed by the employment of thc'form con a-ac;

'3 are now again bro ight I-tioii of the invention illlustrated in 4: lows :Corresponding to the form of the to 7, which as previously mentioned, is

"formed in such'a manner that the raised feed rollers are automatically moved" back a ainst' the platen by the backward rotation of theplaten and held in this position.

"In order to'attain this end, the billing meclr,

anism and also the coupling of the previously. described form of construction of the invention is somewhat altered without however the main idea of the invention, that is to say the automatic coupling on the backward rotation'and the automatic .release of the platen Ion the forward rotation 1} being influenced.

The platen 2 3 is joiirrialed in known manner in the paper carriage end piece 1.

Against this platen bear the feed rollers 22 which are carried by arms 22 .which latter are pivotally mounted on the platen frame in which the platen is mounted andare pressed on to the platen by means of springs "which are however not illustrated. The release of the feed rollers; ti a t is to say their raising from the' platen isigfiected by the action'of the releasing lever 2 mounted on the shaft 24, by means of a-double lever 25 f likewise securely mounted on this shaft.

'The billing mechanism in this case consists of the small and' wheel 21 arranged on the axle 4. On ue aide 4'which is insorted into the platen axle or otherwise rigidly connected with the same, there is mounted thecap' aped sIe A. 27 which, together with the toothed wheel 30 forms a casing in the interior of'which is a ratchet wheel 28 mounted on the axle 4. The parts 27 and 30 are free to rotate on the axle 4. The cap 27 is provided on its upper side with a slot through which there projects a pawl 29, which is pivotally mounted on the flanged part 27 of the ca 27, and wh ch operates together. with theratchet whe 28. This pawl 29. is generally held in engagement with the ratchet wheel 28 by means of a spring 31, but can be disengaged from, and

held out of engagement with the ratchet Wheel 28 by means of the pr 'ection 33 through the action of the head 3- which is rotatably arranged on the flange 27 of the cap 27. In the notches of the toothed wheel 30 therevengages a pin 34 which is secured on a sleeve 38. The latter is axially movable on the shaft 24 against the action of a spring 559 and is provided with a slot 40 into which engages the pin 44 seured on the shaft 24. ()n the sleeve 38 there is further secured a projection 36 or the latter is in one piece with said sleeve and can project into a slot 37 in the la e 27? of the cap 27. By the side of the slot 37 there is provided a stop on the flange 27 which acts together with a stop 46 on the toothed wheel 30. The method (if-working of this form of construction of the invention is as fol-' invoice head the stop 46 on the toothed wheel 30 is first adjusted with respect to the stop 35 on the flange 27*. This is effected by the sleeve 38 being drawn to the tion shown in Fig. 5, that is the platen rollers 22 are raised so that the invoice sheets can be withdrawn. The page of the-book is during this time, held as was previously the case by any known device whatever in such a-manner. that a movement of same when withdrawing the invoice sheet cannot occur. The paper guiding mechanism is now again closed and the writing cylinder is rotated backward by means of the small hand wheel 21' and by means of the ratchet wheel 28 and the pawl 29, the casing 27 is carried forwardwith same until the stop 35 'in the flange 27 comes in contact with the stoppin tfi'on the toothed wheel 30. If however before the backward movement, the release lever 2 should through an oversight not'bereturned to its original position, then the periphery of the flange 27 .will come into contact with the projection 36 on the backward rotation (in Fig. 5, in a clockwise direction) and press down this latter and hold same in this lower position (see Fig. 7). Thus the releasing lever 2 is brought back into its position of rest so that the platen rollers 22' are again in contact with theplaten 23. When the backward rotation of the platen'has reached its limit by the stop 35 striking against the stop 46 a new in- -voice sheet is inserted from the paper guiding plate and the platen is again rotated forward until the first line to be. written arrives in the correct writing position. Upon the first following backward rotation, the ratchet wheel 28 takes with it the casing 27'by means of a pawl 29. On the forward movement, the same parts take the casing with them by thepawlf29 being forced into the ratchet wheel 28 by means of the spring 3 The strength of this spring is determined in relation to the friction occurring in the moving parts in such a manner that it overcomes the resistance, which is kept as small as possible, between said parts. .Thus on the forward rotation the connection is SillllClBIltl) powerful between, the ratchet wheel and the sleeve 27 to carry around the sleeve 27 also during the forward rotafurther rotated, the locking device 28, 29

being then idle. it is clearly evident thatj a raising fof the releasing lever, that is to say a release of the feed rollers can only occur when the slot 37 in the flange 27* is above the pro ection 36, while in all remaining positions the releasing lever is locked. lit 1's likewise also evident that on the backward rotation of the platen, the paper releasing lever which may through an oversight not have been returned to its initial position of rest will be automatically returned. i

1. In a typewriting machine, the combination with a rotary platen; of stop devices adjustable with respect to the platen'and to one another,means to hold one of said devices stationary in it's adjusted position under all conditions of operation of the platen, means always moving in/ unison with the platen and cooperating with said stop devices to permit the platen to move only a predetermined distance in one direction, and for permitting unrestrained movement of the platen in the other direction, and i'neans on the stop de vice that is held stationary to render the means moving with the platen inoperative.

2. In a typewriting machine, billing mechanism comprising in combination a rota-i table platen, paper feed rollers adapted to coact therewith, means *i'o r releasing said feed rollers trom the platen, means automatically connected to the platen to rotate therewith when the platen is rotated in a backward direction to limit the'extent of backwardrotation of the platen, and means for automatically returning; the feed rollers into engagement with the platen and retaining them in such position when the platen is rotated in a backward direction.

3. In a typewriting machine, the conibinatime with its platen and paper feed rolls ar-' ranged for movement to and from the platen; of two stop devices ad ustable with respect to each other and arranged to form housing, means to hold oneof thedevices in ad usted stationary position, an element in said housing and movable in unison with said platen and cooperatingvvith said devices to permit the platen to move re iward a pre-determined amount, and to be free to move forward any amount, and mechanism actuated by one of the devices to move and hold the paper feed rolls against the platen during; such rearward movement l. In a typewriting machine, the C(llflblllii tion with its platen and paper feed rolls ranged for movement to and from the platen; of two stop devices, each having a stop, and means to lock one of the devices in adjust-ed stationary position with respect to the other device, a notch in the movable element adjacent its stop, a ratchet con nected with the platen, a pawl on the movable device engaging the ratchet Wheel, a projection'in the path of movement 01 the stop on the movable device,'adapted to enter said notch and also in the path of the pe riphery of said elemenhmechanism operated.

by said'proieetion to move the paperfeed rolls, whereby said projection acts as a stop for the movable element at the end of its forward movement and may enter said notch when releasing the feed rolls, and is acted upon by said periphery to return the feed rolls. v

In testimony whereoi I have alllxed my signature. 

